ࡱ> FHEW bjbj~~ 7*eeK58Qm42(p   E!"g! s!'''''''$),'{!E!E!{!{!'  4'1$1$1${!R  '1${!'1$1$a&@& `/s3!R&'(02(&>-"x>-&>-&{!{!1${!{!{!{!{!''#{!{!{!2({!{!{!{!>-{!{!{!{!{!{!{!{!{! : This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (Tenants). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs. SECTION 262900 - MOTOR CONTROLLERS GENERAL DESCRIPTION This section describes magnetic motor starters and motor control centers. Provide control and auxiliary contacts as required. REFERENCES NEMA: National Electrical Manufacturers Association. RELATED WORK SPECIFIED ELSEWHERE Section 262400, Switchboards and Panel Boards PRODUCTS ACCEPTABLE MANUFACTURERS Motor control centers, motor starters, and disconnects shall be of the same manufacture as the distribution equipment specified in Section 262400, Switchboards and Panel Boards. MOTOR CONTROL CENTERS NEMA Class 1, type B, plugin construction, floor-mounted, free-standing, 15inches deep, 20inch section width as required, complete with combination starter units, terminal boards, wireways, control circuit transformers, fuses, and ground bus. Bussing shall be copper and braced for 42,000 amperes minimum with main bus rating as shown on the drawings and bussing for future extension. Wireways shall have no less than 6inches of height at the top and no less than 9inches at the bottom. If necessary, a subbase may be provided. Wireways shall not be obstructed by neutral bussing, terminals, or other devices unless additional space is provided. Vertical wireways shall be provided for wiring to starter compartments for load and control conductors. Future provisions shall include bussing and mounting provisions for future starters in every space provided in the assembly by the manufacturer. MOTOR STARTERS Starters shall be across-line, magnetic type, NEMA size 1 minimum, equipped with overload devices in each phase leg. Overload reset shall be manual, accessible without opening covers or doors. Starters shall be combination type with circuit breakers. Equip each starter with an integral individually fused control transformer to provide 120 volt control power. Size transformer to handle all control devices. Disconnect control supply when the motor disconnect is opened. Equip starters with red running pilot lights, H.O.A. switches, and a minimum of two N.O. and two N.C. auxiliary contacts. Circuit breaker type disconnects shall be instantaneous magnetic, motor circuit protector type with adjustable trip settings, sized in accordance with NEMA standards. EXECUTION INSTALLATION Motor Starters: Furnish the motor starting equipment as shown on the drawings and coordinate all motor overload starter relays. Install the starters in motor control centers as shown on the drawings. Motor Control Centers: Install motor control centers parallel with the structural building line. Sections shall fit neatly without gaps, openings, or distortions. Wiring shall be securely tied, at intervals not to exceed 2feet, in wireways. Conduits and raceways entering the assemblies shall be arranged to avoid obstruction of the wireways. As far as practicable, conduits shall enter the assembly close to the associated starter section, avoiding criscrossing and congestion in the wireways. Provide a concrete pad, minimum thickness 3inches, for all motor control centers. COORDINATION Verify the characteristics and the motor full load current for each motor installed, using the actual motor nameplate data. Select and install the proper running overload devices in the starter in accordance with the manufacturers instructions. Provide proper overload protection. 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